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Discriminant Analysis for Assigning Short-Term Counts to Seasonal Adjustment Factor Groupings

Tsapakis, I; Schneider, WH; Bolbol, ASZ; Skarlatidou, A; (2012) Discriminant Analysis for Assigning Short-Term Counts to Seasonal Adjustment Factor Groupings. Transportation Research Record: Journal of the Transportation Research Board , 2256 (2011) 112 - 119. 10.3141/2256-14.

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Abstract

The assignment of short-term counts to groupings of seasonal adjustment factors is the most critical step in the annual average daily traffic estimation process; this step is also extremely sensitive to error resulting from engineering judgment. In this study, discriminant analysis is examined, and several variable selection criteria are investigated to develop 12 assignment models. Continuous traffic volume data, obtained in the state of Ohio during 2005 and 2006, are used in the analysis. Seasonal adjustment factors are calculated with individual volumes of the two directions of travel as well as the total volume of a roadway segment. The results reveal that the best-performing directional volume-based model, which employs the Rao's V algorithm, produces a mean absolute error (MAE) of 4.2%, which can be compared with errors reported in previous studies. An average decline in the MAE by 58% and in the standard deviation of the absolute error by 70% is estimated over the traditional roadway functional classification. In addition, time-of-day factors are slightly more effective in identifying similar patterns of short-term counts than when they are combined with the average daily traffic. When directional-specific factors are used instead of total volume-based seasonal adjustment factors, the improvement in the average MAE is approximately 41%. This conclusion is consistent with previous research findings and may result from the division of the data set by direction essentially doubling the sample size, which in turn increases the number of assignment options for a short-term count.

Type:Article
Title:Discriminant Analysis for Assigning Short-Term Counts to Seasonal Adjustment Factor Groupings
Location:US
DOI:10.3141/2256-14
Keywords:Traffic Count, Short-Term Count, Discriminant Analysis, Seasonal Adjustment Factor, Transport
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Civil, Environmental and Geomatic Engineering

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